Analysis of an ungauged T, φ–φ formulation of the eddy current problem with currents and voltage excitationsAlfredo Bermúdez, Marta Piñeiro, Rodolfo Rodríguez and Pilar SalgadoESAIM: M2AN, 51 6 (2017) 2487-2509DOI: https://doi.org/10.1051/m2an/2017034